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Nov 14, 2012 9:00am PST
, it's an earth-moving problem, and we already have a well-developed technology in earth moving. now, in southern california and in many other areas as well, there are seasonal fluctuations in the lake level. typically, lake levels are low in the summer, but whatever season they're low, earth-moving equipment can come in and excavate these sands from the dry foreshore area. the foreshore deltas in these reservoirs contain most of the beach-size sand, and these will be high and dry when lake levels are low. so they can be collected with standard earth-moving equipment and trucked directly to the beach or reintroduced to the stream beds downstream. if there is technology and engineering available for transporting sand around dams, why isn't this being done? one reason may be that many scientists originally rejected the idea that dams actually contribute to erosion. but that is no longer the case. the problem currently seems to be that the value of sand as a coastal resource may still not be fully recognized. a lot of this sand is already excavated by sand and gravel companies for const
Nov 15, 2012 11:00am PST
the environmental laws on the books. brazil has received some help from some new technology and from other ecologists, including chris uhl. uhl is the founder of imazon, a research institute located in the city of belém. the law in pará state says that 50% of all private land must be maintained in forest. until recently, that was very hard to monitor. now, using a system of satellites okgps is casearcher clos sousaitiing realowhat it allows us to do is to pickp signals from the satellites. and through ocess of triangulation we can locate ouels rylyn gr and through ocess to within about ten meters. four... ey've got ur saites now. we are... probably... in this... area. mm-hmm. narrator: if the government chooses, it can use gps to locate property lines on satlite photographs of the landscape. they can then determine how much of a farmer's land has beenleared but enforcement is stty. anotg problem is thenefficient way the cleared land is being used. the most common farming and grazing method here requires the farmer to cut tousandofirm spe,t it dry.ll set by farmers during the dry season
Nov 15, 2012 3:00pm PST
have never been with somebody when they've died. and i think that speaks to health care and technology these days. there was a time when doctors did not always reveal that a patient's condition was terminal. it was a judgment call, based on their perception of the situation and the patient's ability to handle the information. and some would concede that if they were dealing with a man of affairs, a major businessman, they would expect that person, that man to be both levelheaded enough and to have such weighty considerations that if he had cancer, he ought to know, because he would need to make arrangements. but for the rest of us in the hoi polloi, the sense was, doctors knew best. we have become much more honest. basically, you know, patients' rights, patients' autonomy has been increasingly realized. so we no longer really feel we have the right to withhold information from them. so certainly, much more frankly and much earlier, we tell patients about fatal diagnoses. i was just on a shopping line in a grocery store with my young son. he was three at the time, and i was holding him
Nov 14, 2012 8:00am PST
on now. the physics-types and the technology-types are working on. but when--and if and when they're solved, things are gonna be like different. really different. questions? i didn't quite catch the deal on breeder reactors because, say, losing mass is the name of the game. redirectors make it. let's go to that very, very quickly. what a breeder reactor does is very simple. if in your reactor you have 238 of plutonium-- or 235 of plutonium causing the fusion, if you put in some u-238-- i erased it over here-- the 238 will be turned to plutonium. so you're really not gaining any mass. what you're doing is you're converting something that's not very helpful, 238. you're converting that to something that is very helpful, energy-wise, plutonium. and the analogy i used in the book is like putting gasoline-- putting some water in your gasoline in your car. so it isn't like you get more mass than you started with. you're just converting the water to the gasoline. or in this case, you're converting the 238 to plutonium. and it turns out, every reactor is all the time breeding. if you have
Search Results 0 to 3 of about 4